Pump working head



May 23, 1933. s. H. HOBSQN PUMP wpnxme HEAD Filed June 29-, 1931 .Jly. 1

4 sheets-Shea 1 May 23, 1933. s H. HOBSON rum WORKING HEAD Filed June 29, 1931 4 Sheets-Sheet 2 a MZ ZAMW 2 NM. N w @W May 23, 1933.

s. H.HOBSON 1,910,766 PUMP WORKING HEAD 4 Sheets-Sheet 5 Filed June 29, 193

y 1933- s. H. HOBSON PUMP WORKING HEAD Filed June 29, 1931 4 Sheets-Sheet 4 a 4 a a -I 7"- J afi ,0 0 1 x a L O m l M, 4N. a J J 7 a. a I a Patented May 23, 1933 I UNITED TA ES PATENT oFFica STANLEY H. HOBSON, OI ROCKFORD, ILLINOIS, ASSIGIIOB 'IO GEO. D. BOPEB CORPORA- TION, O1! ROCKFORD, ILLINOIS, A CORPORATION 01' ILLINOIS your woakme inn An Application filed June 29, 1831. Serlal No. 547,867.

This invention relates to a working head for deep well pumps.

Geared working heads have been objectionable because of the multiplicity of moving parts required and the uncertainty oflubrication especially under adverse operating conditions, as, for example, in farm installations cifically stated, consist in:

where the outfit is called upon to take care of the entire farm pumping service and is seldom, if ever, inspected to see if it is getting proper lubrication. It is, therefore, the principal object of my inventlon to prov1d e a hydraulically operated working head utllizing oil as the working fluid and designed so that all of the moving parts, the number of which is reduced to a minimum, far below what is required in a geared working head, operatecontinuously immersed in oil. Thls makes for a very substantial outfit and one which will last practicall indefinitely. As will soon appear, the hea is designed to 0perate efiiciently even when the oil level in the tank has dropped down to a very small fraction of the original supply. In other words, where a geared wor ng head, to operate quietly and with proper lubrication, relied upon the presence of a definite amount of oil in the reservoir, this head is unaffected by a considerable drop in the oil level. e

Other objects of myinvention, more spe- 1. The mounting of the hydraulic motor rigidly on the base, and the fastening of the oil tank onto the side of the motor, thereby utilizing the motor itself as one side of the tank, and locating the joint so that, if any leakage develops,-it can be easily taken care of".

5. Mounting the valve chest directly on the side of the hydraulic motor inside the tank, and providing a face late for the oil' pump directly on the valve 0 est, for support of the pump with the valve chest on the motor, immersed in the oil in the tank;

3. Providing a hole in the outer end wall of the tank for extension therethrough ofthe oil pump shaft, and an adjustable prop for the outer end of the tank on the base, permitting adjustment in the elevation of the tank to bring the hole in accurate alignment with the shaft, and

4. Providing covers cooperating with the Oil tank and the hydraulic motor to completely enclose all of the movin parts for protectlon thereof, and prevent dirt or water from getting into the oil.

The invention is described hereinafter by reference to the accompanying drawings in which-*- Figs. 1 "and 2 are, respectively, a side and plan view of the working head of my in:

Fig. 7 is a horizontal section on the line 77 of Fig. 3 and Fig. 8 is a vertical sectional detail in the plane of the line 88 of Fig. 7. P i The same reference numerals are applied to corresponding parts throughout the views. The working head has a base 10 arranged 'to be set on a suitable foundation over the well casing alongside the usual drop pipe which, as is well known, is disposed substantially centrally in the well casing and has the pum rod 11 extending downwardly thereln. he drop ipe is arran ed to thread at 12 into the head 13, from w' ich the discharge pipe- 14 extends as shown, the same being extended to the usual storage tank forming a part of the water su ply system. An electric motor 15 'is mounte on one and of the base,- and a hydraulic motor 16 together with its oil tank 17 on the other end.

he oil in the tank, as will soon appear, con- I stitutes the working fluid ahd at the same time, the lubricant for such of the parts of the Working head as require lubrication. A light 011 is suitable for the purpose but in extremel cold weather it is a good practice to pour in kerosene to keep the fluid from becoming too heavy. The hydraulic motor 16 has a valve chest 18 and oil pump 19 provided in connection therewith in the tank 17. The pump 19 is driven through a suitable coupling connection 20 with the armature shaft 21 of the electric motor 15 and pumps oil directly from the inside of the tank 17 v and delivers itthrough the valve chest 18 to the hydraulic motor 16 for reciprocation of the plunger rod 22, which is coupled as indicated at 23 with the pump rod 11. So much for a general understanding of the working head of this invention. This working head is similar to that disclosed in my copending application Serial No. 372,632, filed June 21, 1929, now Patent Number 1,906,965, and embodies the various improvements in construction and arrangement indicated above and described in detail hereinafter.

The hydraulic motor 16, in accordance with the present invention, comprises a cylinder block 24 providing a cylinder 25 between opposite side walls 26 to which the cylinder is joined by a front wall 27 and top and bottom walls 28 and 29. The cylinder block 24 is fastened to the base 10 by studs 30 extending from the bottom wall 29 through holes in the base and having nuts 31 threaded thereon under the base. Thisobviously provides good rigid support for the hydraulic motor such that there is very little danger of the same working loose. A plate 32 is bolted to the bottom wall 29 to close the lower end of the cylinder 25. A one-piece cast yoke member 33 is mounted on top of the cylinder block 24 and fastened thereto as by bolts 34.

A guide post 35 extends downwardly from the upper end of the yoke and has the hollow rod 36' of a piston 37 slidable thereon. The

iston 37 is reciprocable in the cylinder 25 by means of the oil delivered first to one end of the cylinder and then the other. A ring 38 in which the piston rod 36 has a close working fit, is clamped in place in the upper end ofthe cylinder 25 in the bolting of the yoke 33- on the cylinder block. The ports for the opposite ends of the cylinder appear at 39 and 40 of Figs. 3 and 4. ,A two-piece crosshead 41 is arran ed to be secured to the u per end of the plston rod 36 by means of boits 42 and at one end has connection with the plunger rod 22 by means of the nuts 43 threaded on the rod, and at the other end has connection with the stem 44 of a pilot valve 45, whereby to reciprocate the pump rod 11 in the reciprocation of the piston, and operate the pilot valve 45 in timed relation therewith.

The oil tank 17, according to the present invention, is arranged to be bolted onto the hydraulic motor for sup ort and so as to utilize the motor as one side of the tank. A fiat face 46 is provided on the bottom wall 29 in the same plane with a flat face 47 on the side walls 26, and the tank 17 is provided the bottom and side walls as best'appears in Fig. 6, whereby to permit the fastening of the tank to the cylinder block 24 of the motor with an oil-tight joint, as by means of bolts 48 passed freely through holes in bosses formed in the block 24 and threaded in bosses 49 provided on the inside of the tank 17. In

addition, a pair of bolts 50 are suitably extended from the bottom of the tank 17 and threaded into the cylinder block 24-t0 make for a better joint. A gasket is suitably interposed between the meetin faces 46-46 and 47--47 as indicated in ig. 6 to insure an oil-tight joint. In this way, a reservoir 51 for 011 is provided jointly by the cylinder block 24 and tank 17 the block forming one side of the tank, and the joint between these parts is in full View so that, if any leak de- "velops, it will be noticed immediately and as by means of screws 57 to the cylinder block 24, and still another cover 58 similar to the cover 54 is fastened to the opposite side of the yoke 33 as by means of screws 59.

The discharge pipe 14 extends through a hole 60 in the lower front cover 56 as indicated in Fig. 3. This construction provides complete enclosure of all of the working parts for protection thereof and neater external appearance of the working head, as will be apparent upon inspection of Fig. 11, and moreover seals the unit against any dirt and water, so that the working arts remain clean and the oil uncontaminated The valve chest 18 is in the form of a casting 61 arranged to be bolted as at 62 to the cylinder block 24 with its ports 63 and 64 indirect communication with the ports 39 and 40 of the cylinder 25 as best appears in Figs. 3 and The outer end of the casting is made i the form of a face plate for the pump 19 as appears at 65 whereby to support the pump along with the valve chest on the hydraulic motor 16, immersed in the oil in the tank 17 The housing 66 of the pump 19 and its other face plate 67 are bolted as at 68 to the face plate 65 to com-' plete the assembly of the pump. The pump is made generally alon the lines of that disclosed in my copendlng application, Serial No. 300,666, filed August'20, 1928, and has a suction chamber 69 on one side of the pumping gears and a discharge chamber 70 on the other side. The suction chamber 69,

with complemental flat faces 46' and 47 on in accordance with my other copending application, communicates directly with the reservoir 51 in the tank 17 through an inlet port 71. The discharge chamber 70 commun'i'cates with the valve chest 18 through a discharge port '72. Thus, the oil in the continuous operation of the pump is pumped from the reservoir 51 in the tank and discharged under pressure into the valve chest at 72. Now, the valve chest has, in addition to the pilot valve 45, a main valve 45' mounted for reciprocation therein. As described in my first mentioned copending application, the pilot valve is shifted by engagement of the crosshead 41 with stops 73 and 74 provided on the stem 44 and, when shifted to one-limit position, it causes the main valve tween the port 72 and one of the two ports of'the cylinder 25, establishes communication between the exhaust port 75 and the other port of the cylinder, so that, as oil is 77 and the hole 78.

admitted under pressure to one end of the cylinder, the oil in front of the piston is allowed to escape and be discharged back into the reservoir 51. Hoods 76 are provided on opposite sides of the valve chest to deflect the oil downwardly from the exhaust port 75 toward the bottom of the reservoir, similarly as described in my first mentioned co pending application. This prevents excessive splashing'of oil so that there is no danger of oil being lost through the filler opening 52.

The driven shaft 77 of the pump 19 projects through a hole 78 in the outer end wall of the tank 17 for coupling connection at 20 with the armature shaft 21 of the electric motor 15. Inasmuch as the hole 78 is so remote with reference to the point of attach-- likewise remote with reference to the point ofattachment of thepump and valve chest on the cylinder block, it becomes a problem to.

secure accurate alignment between the shaft Accurate alignment is, of course, essential because there would otherwise be an unnecessary drag on the motor15 and premature wear of the shaft 77 and at the hole 78, and the working head would not 0 rate as smoothly and quietly as desired. F b r this reason, I contemplate providing a jack screw 79 below the outer end of the tank 17 threaded in the base 10 and arranged to be locked by means of a lock nut 80. The screw 79 can be adjusted easily to secure exact alignment between the hole 78 and shaft 77. A pair of sealing rings 81 and 82 are provided on the shaft 77 inside the tank 17 between the pump and the wall of the tank, the rings being urged apart by means of a coiled com pression spring 83 so that the ring 8l seals the pump against leakage along the shaft, and the ring 82 seals the tank against leakage along the shaft.

Referring to Fig. 8 it will be observed that an arm 84 projects laterally from the upper end of the plunger rod 22 whereby to reciprocate another rod 85 aflixed to a plunger 86 working in a cylinder 87 mounted on the head 13 in the usual way. It has been common practice in the past to provide a pet-cock normally leaving the lower end of the cylinder 87 open to the atmosphere except when additional air is needed in the storage tank, whereupon, the pet-cock was arranged to be closed to cause air to be forced into the tank upon each down-stroke of the plunger 86. The complete enclosure of the working head, however, makes the use of a pet-cock impractical because it would necessitate the removal of the cover 56 whenever the pet-cock was to be closed. In accordance with my invention,

I have therefore, provided a screw plug 88' having a universal joint connection 89 with an extension handle 90 reaching through a hole in the lower front cover 56. The plug 88 is normally kept open and, when additional air is needed in the storage tank, the plug is closed by turning the handle 90. Then, on each upstroke of the plunger 86, air is trapped in the cylinder 87 and is forced into the tank on the down-stroke, in a manner well known in this art.

It is believed the foregoing description conveys a good understanding of all of the objects and advantages of my invention. It is manifest that various changes in design and construction might be made without seriously departing from the spirit and scope of the invention. The appended claims have, therefore, been drawn to cover all legitimate modifications and adaptations.

I claim:

1.. A unit of the character described comprising in combination, a base, a hydraulic motor of the reciprocating type mounted with the cylinder block thereof vertically disposed on and secured to the base in upright position and with the piston rod thereof extending upwardly therefrom, a tank for working fluid rigid with the cylinder block on one side thereof for support on the base, said arrangement also permitting of direct discharge of spent working fluid from the motor into the tank, a pump disposed in said tank arranged to pump fluid directly therefrom and deliver the fluid directly to the motor for operation thereof, means for driving the pump having connection therewith through a wall of the tank, said hydraulic motor having a yoke extending upwardly from the cylinder block thereof having a guide thereon for the piston rod, the top of said tank being open for filling and other purposes,-and a cover cooperating with the open top of the tank and the aforesaid yoke to close the tank.

A unit of the character described comprising in combination, a base, a hydraulic motor of the reciprocating type mounted with the cylinder block thereof vertically disposed on and secured to the base in upright position and with the piston rod thereof extending-upwardl y therefrom, a tank for working fluid rigid with the cylinder block on one side thereof for support on the base, said arrangement also permitting of direct discharge of spent working fluid from the motor into the tank, a pump disposed in said tank arranged to pump fluid directly therefrom and deliver the fluid directly to the motor for operation thereof, means for driving the pump having connection therewith through a wall of the tank, said hydraulic motor having a yoke extending upwardly from the cylinder block thereof having a guide thereon for the piston rod, the top of said tank being open for filling and other purposes, a cover cooperating with the open top of the tank and the aforesaid yoke to close the tank, means on the diametrically opposite side of the cylinder block from the tank providing an operating connection between the piston rod and the device to be operated thereby, and cover means cooperating with the cylinder block and yoke to enclose the last mentioned means.

3. A unit of the character-described oom prising in combination, a base, a hydraulic motor of the reciprocating type mounted with the cylinder block thereof vertically disposed on and secured to the base in upright position and with the piston rod thereof extending upwardly therefrom, a tank for working fluid rigid with the cylinder block on one side thereof for support on the base, said arrangement also permitting of direct discharge of spent working fluid from the motor into the tank, a pump disposed in said tank arranged to pump fluid directly therefrom and deliver the fluid directly tothe motor for operation thereof, means for driving the pump having connection therewith through a wall of the tank, said hydraulic motor having a yoke extending upwardly from the cylinder block thereof having a guide thereon for the piston rod, the top of said tank being open for filling and other purposes, a closure for the tank, means on the diametrically opposite side of the cylinder block from the tank providing an operating connection between the piston rod and the device to be operated thereby, and cover means cooperating with the cylinder block and yoke to enclose the last mentioned means.

4. In'an apparatus of the character described, the combination, in a unitary assembly, of a base, a working cylinder supported on said base, a'fluid operated piston in said cylinder having the rod thereof extending from the cylinder for convenient connection with the device to be operated, whereby to reciprocate said device in the reciprocation of the piston, a tank for working fluid rigid with the cylinder on one side thereof, whereby the same is supported on the base by said cylinder and whereby direct discharge of spent working fluid is permitted from the cylinder into the tank, a pump disposed in said tank arranged to pump fluid directly therefrom and deliver the fluid directly to the cylinder for operation of the piston, a drive motor supported on said base having connection with the pump through a wall of the tank, and valve mechanism in said tank communicating with the outlet of the pump and arranged to establish communication for said outlet alternately with the opposite ends of said cylinder to reciprocate the piston, said valve mechanism being arranged to discharge spcnt fluid from the cylinder directly back into the tank.

5. In an apparatus of the character described, the combination in a unitary assembly, of a base, a working cylinder supported on said base, a fluid operated piston in said cylinder for convenient connection with the device to be operated, whereby to reciprocate said device in the reciprocation of the piston, a tank for working fluid rigid with the cylinder on one side thereof, whereby the same is supported on the base by said cylinder and whereby direct discharge of spent working fluid is permitted from the cylinder into the tank, a pump for supplying working fluid under pressure alternately to opposite ends of said cylinder rigidly supported on Said cylinder in said tank, whereby the same is adapted to pump fluid directly from the tank and deliver the fluid directly to said cylinder, a drive motor supported on said base having connection with the pump through a wall of the tank, and valve mechanism in said tank communicating with the outlet of the pump and arranged to establish communica tion for said outlet alternately with the opposite ends of said cylinder to reciprocate the piston, said valve mechanism being arranged to discharge spent fluid from the cylinder directly back into the tank.

An apparatus as set forth in claim 4 including auxiliary supporting means for the tank between the base and the bottom of the tank, said means being disposed adjacent the outer end of the tank spaced from the cylinder and being adjustable relative to the tank and base as desired, whereby to make the tank rigid relative to the base.

7. A unit of the character described comprising in combination, a base, a hydraulic motor of the reciprocating type mounted with the cylinder block thereof vertically disposed on and secured to the base in upright position and with the piston rod thereof extending upwardly therefrom, a tank for working fluid rigid with the cylinder block on one side thereof for support on the base, said arrangement also permitting of direct discharge of spent working fluid from the motor into the I tank, a pump disposed in said tank arranged to pump fluid directly therefrom and deliver the fluid directly to the motor for operation thereof, means for driving the pump, valve mechanism in said tank communicating with the outlet of the pum and arranged to estab- 1 lish communication or said outlet alternately with the opposite ends of said cylinder block to reciprocate the piston, said valve mechanism being arranged to discharge spent fluid from the cylinder directly back into the tank, a yoke for said hydraulic motor extending upwardly from the cylinder block and having a guide thereon for the piston rod, means providing an operating connection between the piston rod and the valve mechanism, and cover means cooperating with the cylinder block and yoke to enclose the last mentioned means. I

8. A unit as set forth in claim 7 wherein the top of said tank is open for filling and other purposes and wherein the cover means set forth in claim 7 is constructed so as to close the open top of said tank.

In witness ofthe foregoing I aflix my signature.

STANLEY H; HOBSON. 

